Ensuring the Low Vibration of Two-Pole Motors on Flexible Foundations: A Manufacturer-System Integrator Collaboration

Motor vibrations are tested as a part of factory acceptance testing (FAT), normally on a massive foundation. In two-pole motors, there are two main sources of vibration: rotor unbalance and electrical twice-line frequency excitation. Low vibration implies that the natural frequencies of the motor ar...

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Bibliographic Details
Published in:IEEE industry applications magazine 2020-11, Vol.26 (6), p.20-28
Main Authors: Holopainen, Timo P., Roivainen, Janne, Aarnivuo, Samu
Format: Magazinearticle
Language:English
Subjects:
Acceptance tests
Condition monitoring
Excitation
Induction motors
Motors
Resonant frequencies
Rotors
Stiffness
Synchronous motors
Vibration
Vibration monitoring
Vibrations
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Summary:Motor vibrations are tested as a part of factory acceptance testing (FAT), normally on a massive foundation. In two-pole motors, there are two main sources of vibration: rotor unbalance and electrical twice-line frequency excitation. Low vibration implies that the natural frequencies of the motor are separated from the corresponding excitation frequencies. Usually, if the site foundation is rigid, the vibration levels repeat FAT values with minor changes and are well within the initial limits for condition monitoring. However, if the foundation is flexible, the motor vibration may produce unexpected results. The aim of this article is to introduce a procedure to help ensure low vibration in site conditions in these cases. The procedure relies on early cooperation between the motor manufacturer and the system integrator based on the horizontal and vertical stiffness of the foundation. The most cost-effective solution can be reached by incorporating proper motor design features in conjunction with the design of the mounting base.
ISSN:1077-2618
1558-0598
DOI:10.1109/MIAS.2020.2982708